Asymmetrical Bits

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Turn screws that have the tamper-resistant asymmetrical drive exclusive to McMaster-Carr. Also known as insert bits, use these in hand drivers or with a bit adapter in power tools.

1/4" Hex Shank Size
For Drive Size	Overall Lg.	Material		Each
U10	1"	Steel	000000000	000000
U25	1"	Steel	000000000	00000